span.dcontexto{
    position:relative;
    /*font:12px arial, verdana, helvetica, sans-serif;*/
    padding:0;
    color:#039;
    text-decoration:none;
    /*border-bottom:1px dotted #039;*/
    cursor:help;
    z-index:24;
}
span.dcontexto:hover{
    background:transparent;
    z-index:25;
}
span.dcontexto span{display: none}
span.dcontexto:hover span{
    display:block;
    position:absolute;
    width: 230px;
    top:-1em;
    text-align:left;
    left:25px;
    font: 12px arial, verdana, helvetica, sans-serif;
    padding:5px 10px;
    border:1px solid #999;
    background:#e0ffff;
    color:#000;
}
img.hform {
    position:relative;
    top: 3px;
}